«مِنْ جِرَابَكْ مَرْحَبَا بَكْ»

The saying mocks a false benefactor: someone takes hold of another person's money or goods, then hands part of it back with a show of generosity, expecting thanks. The 'welcome' is ironic, not sincere hospitality, because everything given came out of the receiver's own bag. In Arabic the two halves rhyme on a closing -bak sound.

In a second, separate application, it describes a foolish or insolent person being repaid in their own coin. Whatever rudeness or folly they put out is returned to them in kind, so what they receive is drawn, as it were, from their own supply.

Say it wryly when someone presents as a gift or favor something that already belonged to the recipient, or when a foolish person gets back exactly the foolishness they dealt out. Context shows which sense is meant. It suits pointed, mocking remarks rather than polite conversation.